Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Aug. 31, 2019 USD ($) state	Aug. 31, 2018 state
Loss Contingencies [Line Items]
Settlement | $	$ 1.5
Children's Book Publishing and Distribution
Loss Contingencies [Line Items]
Number of states in which sales tax remitted (in states) | state	43	11